Japan Geoscience Union Meeting 2014

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Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS21_28AM1] Biogeochemistry

Mon. Apr 28, 2014 9:00 AM - 10:45 AM 511 (5F)

Convener:*Muneoki Yoh(Tokyo University of Agriculture and Technology), Hideaki Shibata(Field Science Center fot Northern Biosphere, Hokkaido University), Naohiko Ohkouchi(Japan Agency for Marine-Earth Science and Technology), Youhei Yamashita(Faculty of Environmental Earth Science, Hokkaido University), Chair:Taichi Yokokawa(Center for Marine Environmental Studies, Ehime University), Hidetaka Nomaki(Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology), Yoshinori Takano(Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Seiya Nagao(Institute of Nature and Environmental Technology, Kanazawa University)

9:15 AM - 9:30 AM

[MIS21-02] Niche separation of nitrifiers and anammox in deep-sea sediments.

*Takuro NUNOURA1, Miho HIRAI1, Manabu NISHIZAWA1, Juliarni -1, Hidetaka NOMAKI1, Hisami SUGA1, Eiji TASUMI1, Junichi MIYAZAKI1, Akiko MAKABE2, Keisuke KOBA2, Ken TAKAI1 (1.JAMSTEC, 2.TUAT)

Keywords:nitrification, anammox

We revealed the distribution patterns of nitrifiers and anammox along with geochemical gradients in a hadopelagic sediment core from the Ogasawara Trench (Nunoura et al. 2013). The results presented novel insights into the inorganic nitrogen cycle in deep-sea sediments as shown below. 1) Thaumarchaeotes and Nitrospina predominates in the ammonia and nitrite-oxidizing communites, respectively. 2) The pore-water nitrate recorded isotopic signatures of nitrification. 3) Abundance of anammox was likely regulated by not only by redox potential but also by nitrite supply from ammonia oxidation. 4) Maximum abundance of denitrifier occurred at sediment surface. The purpose of this study is to know the roles of benthic microbial inorganic nitrogen cycle in diverse deep-sea environments. In this study, we compared pore water chemistry, and abundance and composition of nitrifier and anammox populations in 6 distinct regions, and will discuss about the roles of dynamic nitrogen cycle in deep-sea benthic environments.